implemented farneback optical flow on CPU #17

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
added Farneback's optical flow to the pipeline

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
adds some includes to the blobdetector so it might work.

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
fixes the bug with the BlobDetection (CPU) #57
adds background substraction module to the main pipeline #3